Luchtvochtigheid — 2020
| Month | Alphen aan den Rijn | Leiderdorp | Difference |
|---|---|---|---|
| Jan | 89.5 % | 88 % | +1.5 |
| Feb | 80.7 % | 79.9 % | +0.8 |
| Mar | 73.4 % | 74.4 % | -1.0 |
| Apr | 66 % | 69.4 % | -3.4 |
| May | 68 % | 71.9 % | -3.9 |
| Jun | 73.7 % | 76.7 % | -3.0 |
| Jul | 77.3 % | 76.8 % | +0.5 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |